public class ResponseDemo3 extends HttpServlet {

	private static final long serialVersionUID = -5232952995715123473L;

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		// ServletOutputStream outputStream = response.getOutputStream();

		// outputStream.write("hello,download!".getBytes());

		String realPath = this.getServletContext().getRealPath("/download/日本妞.jpg");

		String filename = realPath.substring(realPath.lastIndexOf("\\") + 1);

		//如果下载文件是中文文件,则文件名需要经过url编码

		response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(filename,"utf-8"));

		InputStream in = null;

		OutputStream out = null;

		try{

		in = new FileInputStream(realPath);

		int len = 0;

		byte buffer[] = new byte[1024];

		out = response.getOutputStream();

		while((len=in.read(buffer))>0){

			out.write(buffer,0,len);

		}

		}finally{

			if(in!=null){

				try{

					in.close();

				}catch(Exception e){

					e.printStackTrace();

				}

			}

		}

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		doGet(request, response);

	}

}